So for now, Minimalistic Text Widget support has been turned off. I can't act as the middle-man between someone that has a broken plugin and the developer of that plugin. Instead, I've kindly asked the Minimalistic Text Widget dev to support his own broadcast name. That way anything destined for Minimalistic Text Widget won't get sent to any other apps. Also, other new apps won't have to worry about weird stuff happening when they update Minimalistic Text Widget.
Many thanks to the Minimalistic Text Widget dev for his help!
EDIT: Looks like a really easy fix is to set the package and class name of the broadcast to the package and class name of Minimalistic Text Widget's broadcast receiver. But that's a job for another day. Now is sleep time :)
EDIT: This post was written during the initial-rage of unhelpful comments appearing on the market. After looking over the documentation of a Locale plugin, Llama shouldn't have been sending a broadcast to everything that watches for com.twofortyfouram.locale.intent.action.FIRE_SETTING. I've updated the Minimalistic Text Widget wiki accordingly, so now only Minimalistic Text Widget is targeted by the broadcast. Look at the latest blog posts for a test version.